Insulator-support.



0. P. MEGAHAN.

INSULATUR SUPPORT.

APPLICATION FILED ocT. I9. 191s.

Lw. Patented Mar. 4,1919.

mim/IWW@ MIMI Yi WM AAJ@ @wom/Imag OLIVER P. MEGAI-IAN, OF WESTERVILLE,OHIO.

INSULATOR-SUPPORT.

Maaate.

Specification ofetters Patent.

Patented Mar. 4, 1919..

Application led October 19, 1918..- Serial No. 258,916.

To all whom t may concern.'

Be it known that I, OLIVER P.. MEGAHAN, a citizen of the United States,residing at Westerville, in the county of Franklin and State .of Ohio,have invented a certain new and useful Improvement inInsulator-Supports, of which the following is a specification.

This invention relates to the type of insulator support or cross armshown and described in the Letters Patent of the United States issued tome January 5, 1915, No. 1,123,342, and the obect of the presentinvention is to simplify the construction of such devices and renderthem more easily manufactured. Another object of the invention is torender such a construction less likely to permit leakage of theelectricity should a line become detached and sag or fall on it.

The invention is embodied in the details of construction shown in theexample depicted in the accompanying drawings, set forth in thefollowing description and finally claimed.

In said drawings* Figure 1 is a longitudinal section of the outer shell.

Fig. 2`is a transverse section, on a larger scale, of said outer shell.

F ig. 3 is a plan View of a fraction of the outer shell looking at thefilling or under side thereof.

Fig. 4 is a combined sectional and perspective view of a fraction of theouter shell in position to be filled with concrete.

Fig. 5 is a perspective view of a fraction of the curved bar or stripused to retain the filling of concrete supplied to the shell.

Fig. 6 is a transverse section of the insulator support showing itsfilled or completed condition.

Fig. 7 is a diagrammatic view of the sheet metal as cut before beingformed into the outer shell.

The metallic outer shell is cut, pressed or bent out of sheet metal toform a hollow trough-like body with a curved top 5, sloping sides 6,lips 7, and closing'ends 9, the last being substantially as in my saidformer patent. The curved top is formed with longitudinal openingsleaving bridges at10.

The lips 7 are slit to form tongues ll that are bent'down and becomeembedded in the filling of concrete subsequently supplied. It will beobservedthat the lips 7 are Hat and not curved as 'in my formerconstruction. The advantage of the present construction is that thehollow body is more easily supplied with the cement to and Hush with thelips. :Io fill the sheet metal shell it is placed in lnverted positionin holders 12 but to form a bottom to prevent the escape of the materialthrough the openings I insert in thc holders 12 a transversely curvedbar 13. Said bar 13 on its concave side molds the material thatconstitutes the top of the insulator support or cross arm. Beforesupplying the cement I put in place iron pins 14 which form the holesfor the reception of the shanks of the glass or porcelain insulators. Infilling the sheet metal shell, as thus described and arranged, I firstspread along the bottom a quantity of pulverized glass or otherinsulating material of a depth sufficient to make a stout layer. Afterthis I pour in the usual concrete mixture of sand, cement and water toentirely fill the shell. The water, more or less charged with cementdrains from said mixture into the pulverized glass and constitutes notonly the binder for the glass but the means of connecting the glasslayer to the body of concrete. In filling the metallic shell suitablereinforcing bars, such as shown at 15 can be placed in position to beembedded in the concrete. After the filling as thus described has hardened and dried the cross arm is ready for attachment to the pole and toreceive the usual glass or porcelain insulators in the usual manner.

The structure thus formed makes. a durable cross arm with the cementportion thoroughly protected from the rapid disintegrat- .f

ing effects of weather. The shells and Shanks can be transported atsmall cost to distant points and the glass and concrete supplied nearthe place of use of the finished cross arm.

titi

The forms and proportions of the parts can be varied Without departingfrom the gist of the invention as claimed.

What I claim is:

1. An insulator sup ort including a sheet metal shell and a fil ing ofconcrete, said shell having an opening at its upper portion l and s ifilling of insulating material eizposed at sald o emng.

2. An msulator support includin a body 10 of concrete havin its upperedge o insulating material mol edv integral therewith, substantially asdescribed.

OLIVER P. MEGAHAN.

